Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-02-18
Computer Physics Communications 168, 32 (2005)
Physics
Condensed Matter
Strongly Correlated Electrons
To be published in Computer Physics Communications
Scientific paper
10.1016/j.cpc.2005.02.001
A software library is presented for the polynomial expansion method (PEM) of the density of states (DOS) developed by two of the authors (N.F. and Y. M.). The library provides all necessary functions for the use of the PEM and its truncated version (TPEM) in a model independent way. The PEM/TPEM replaces the exact diagonalization of the one electron sector in models for fermions coupled to classical fields. The computational cost of the algorithm is O(N) -- with N the number of lattice sites -- for the TPEM which should be contrasted with the computational cost of the diagonalization technique that scales as O(N^4). The method is applied for the first time to a double exchange model with finite Hund coupling and also to diluted spin-fermion models.
Alvarez Gonzalo
Dagotto Elbio
Furukawa Naoko
Motome Yukitoshi
Şen Cengiz
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